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Wepl · 26 August 2017, 16:55

Why do you need to use a different base register then a7?
Are you calling your functions with registers on the stack? In this case it may be a bit uncomfortable.

Code:

 STRUCTURE bla,0
  WORD bla_bum
  ...
  ALIGNLONG
  LABEL bla_SIZEOF

_func movem.l rl,-(a7)
      moveq   #bla_SIZEOF/4-1,dx
.clr  clr.l   -(a7)
      dbf     dx,.clr

      move    #33,(bla_bum,a7)

      add.w   #bla_SIZEOF,a7
      movem.l (a7)+,rl
      rts

is shorter than link/unlk + clear

26 August 2017, 16:55	#11
Wepl Moderator Join Date: Nov 2001 Location: Germany Posts: 866	Why do you need to use a different base register then a7? Are you calling your functions with registers on the stack? In this case it may be a bit uncomfortable. Code: STRUCTURE bla,0 WORD bla_bum ... ALIGNLONG LABEL bla_SIZEOF _func movem.l rl,-(a7) moveq #bla_SIZEOF/4-1,dx .clr clr.l -(a7) dbf dx,.clr move #33,(bla_bum,a7) add.w #bla_SIZEOF,a7 movem.l (a7)+,rl rts is shorter than link/unlk + clear